org.kie.server.remote.rest.extension.ThriftMessageReader.java Source code

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Here is the source code for org.kie.server.remote.rest.extension.ThriftMessageReader.java

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/*
Licensed under the Apache License, Version 2.0 (the "License");
you may not use this file except in compliance with the License.
You may obtain a copy of the License at
    
http://www.apache.org/licenses/LICENSE-2.0
    
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package org.kie.server.remote.rest.extension;

import org.kie.server.remote.io.StreamReader;
import org.kie.server.thrift.protocol.KieServicesRequest;
import org.apache.thrift.TDeserializer;
import org.apache.thrift.TException;
import org.apache.thrift.protocol.TCompactProtocol;
import org.apache.thrift.protocol.TProtocolFactory;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import javax.ws.rs.Consumes;
import javax.ws.rs.WebApplicationException;
import javax.ws.rs.core.MediaType;
import javax.ws.rs.core.MultivaluedMap;
import javax.ws.rs.ext.MessageBodyReader;
import javax.ws.rs.ext.Provider;
import java.io.IOException;
import java.io.InputStream;
import java.lang.annotation.Annotation;
import java.lang.reflect.Type;
import java.util.Queue;
import java.util.concurrent.ConcurrentLinkedQueue;

import static org.kie.server.thrift.protocol.protocolConstants.APPLICATION_XTHRIFT;

/**
 * Created by x3.mbetzel on 12.06.2015.
 */
@Provider
@Consumes({ APPLICATION_XTHRIFT })
public class ThriftMessageReader implements MessageBodyReader<KieServicesRequest> {

    private static final Logger logger = LoggerFactory.getLogger(ThriftMessageReader.class);

    private static final Queue<TDeserializer> T_DESERIALIZER_QUEUE = new ConcurrentLinkedQueue<>();
    private static final TProtocolFactory T_PROTOCOL_FACTORY = new TCompactProtocol.Factory();

    public ThriftMessageReader() {
        logger.info("ThriftMessageReader added");
    }

    @Override
    public boolean isReadable(Class<?> type, Type genericType, Annotation[] annotations, MediaType mediaType) {
        return KieServicesRequest.class.isAssignableFrom(type);
    }

    @Override
    public KieServicesRequest readFrom(Class<KieServicesRequest> type, Type genericType, Annotation[] annotations,
            MediaType mediaType, MultivaluedMap<String, String> httpHeaders, InputStream entityStream)
            throws IOException, WebApplicationException {
        TDeserializer tDeserializer = null;
        KieServicesRequest kieServicesRequest = new KieServicesRequest();
        byte[] bytes = StreamReader.readFromStream(1024, entityStream);
        try {
            tDeserializer = pollTDeserializer();
            tDeserializer.deserialize(kieServicesRequest, bytes);
        } catch (TException e) {
            throw new IOException(e);
        } finally {
            if (tDeserializer != null) {
                T_DESERIALIZER_QUEUE.add(tDeserializer);
            }
        }
        return kieServicesRequest;
    }

    public static TDeserializer pollTDeserializer() {
        TDeserializer tDeserializer = T_DESERIALIZER_QUEUE.poll();
        if (tDeserializer == null) {
            tDeserializer = new TDeserializer(T_PROTOCOL_FACTORY);
        }
        return tDeserializer;
    }

    public static void addDeserializer(TDeserializer tDeserializer) {
        T_DESERIALIZER_QUEUE.add(tDeserializer);
    }

}